EQUIVALENCIA DE UNIDADES LONGITUD: 1 yarda = 3 ft 1ft = 12 in 1in = 2,54 cm 1cuadra=100 varas 1Å = 1 x10–10 m 1 año luz =9,461 x1015 m 1 millaT = 5280 ft 1 millaM= 6076 ft 1 vara = 83,59 cm 1 estadio (furlong) = 1/8 millaT 1 palmo = 1/4 vara 1 vara larga (pole o perch)=198 in 1 legua=3 millaM 1 Fermi=1 x10–15 m 1 braza (fathon) =2 yd 1 parsec = 3,26 años luz 1 jeme = 6 in ------------------------------------------------------------------------------------------------------------AREA: 1área = 100 m2 1 Ha = 100 áreas 1acre = 43560 ft2 ---------------------------------------------------------------------------------------------------------------VOLUMEN: 1 barril p = 42 gal 1 barril = 31,5 gal 1 gal.ing.(real) = 4,542 l 3 3 1l =1 dm 1ml =1cm 1gal =3,785 l 1pinta =1/8 gal 1oz.fl =29,57 ml ---------------------------------------------------------------------------------------------------------------MASA (PESO): 1 lb =16 onz =7000 granos 1 @=25 lb 1qq = 4 @ 1kg=2,2046 lb 1 lbtroy =12 onztroy = 5760 granos 1Tm =1000 kg 1Tc =2000 lb 1 Tl = 2240 lb 1 UTM =9,8 kg; 1 uma = 1,66 x10–27 kg 1 quilate = 200mg 1 slug =32,2 lb ---------------------------------------------------------------------------------------------------------------TEMPERATURA: | TIEMPO: 1día = 24horas 1min = 60s 1ºC = 1,8ºF = 0,8ºRe =1ºK; 1ºF =1ºR | 1 hora = 60 min 1 año = 365,25 días ---------------------------------------------------------------------------------------------------------------RAPIDEZ: 1 nudo (knot)=1 millaM / hora 1 m/s =3,6 km/h ---------------------------------------------------------------------------------------------------------------FUERZA: 1gf = 980 dinas 1 lbf = 32,2 poundal 1 kp = 1kgf = 9,8 N = 2,2046 lbf 1 N =105 dinas ---------------------------------------------------------------------------------------------------------------TRABAJO, ENERGÍA MECÁNICA Y CANTIDAD DE CALOR (EMC): 1J = 1 x107 ergio 1 cal = 4,186 J (e.m.c.) 1 BTU =252,2 cal; 1 kwatt-h =3410 BTU; 1kpm = 9,8 J 1 ev = 1,6 x10–19 J ---------------------------------------------------------------------------------------------------------------POTENCIA: 1HP = 745,7 watts 1 CV (HP métrico) = 735,4 watts ---------------------------------------------------------------------------------------------------------------PRESIÓN: 1 bar = 1 x106 Ba = 1 x105 Pa 1 psi = 1 lbf / in2 1 atm = 760 mmHg = 10333,33 kp/m2 = 14,7 psi = 33.9 ftagua = 101325 Pa = 10,33 magua 1 Pa (Pascal) = 1N/m2 1 Torr = 1 mmHg 1 baria = 1 dina/cm2 PREFIJOS PARA EXPONENCIALES DE 10 Múltiplos Yotta Y 1 x1024 Zetta Z 1 x1021 Exa E 1 x1018 Peta P 1 x1015 Tera T 1 x1012 Giga G 1 x109 Mega M 1 x106 Kilo K 1 x103 Hecto H 1 x102 Deca D 1 x101 Submúltiplos deci d 1 x10-1 centi c 1 x10-2 mili m 1 x10-3 micro µ 1 x10-6 nano n 1 x10-9 pico p 1 x10-12 femto f 1 x10-15 atto a 1 x10-18 zepto z 1 x10-21 yocto y 1 x10-24